Supervised Classification workflow in ENVI 4.8 using WorldView-2 imagery

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1 Supervised Classification workflow in ENVI 4.8 using WorldView-2 imagery WorldView-2 is the first commercial high-resolution satellite to provide eight spectral sensors in the visible to near-infrared range. Each sensor is narrowly focused on a particular range of the electromagnetic spectrum that is sensitive to a particular feature on the ground or a property of the atmosphere. Together they are designed to improve the segmentation and classification of land and aquatic features beyond any other space-based remote sensing platform. Figure.1 illustrates the bands of DigitalGlobe s satellite constellation and where they fall in the visible spectrum (units are in nanometers). It s important to note that the additional bands provide more coverage over the spectrum thus providing more information. The increased spectral fidelity of WorldView-2, combined with very high spatial resolution, will provide the additional data necessary to address the feature classification challenge. For example, when looking at land classes, WorldView-2 is expected to deliver a 10-30% improvement in accuracy compared with traditional VNIR imagery overall. More information of the benefits of the eight spectral bands of WorldView-2 can be found at Fig.1. Spectral Bands of DigitalGlobe s Satellites Supervised classification can be used to cluster pixels in a dataset into classes corresponding to user defined training classes. This classification type requires that you select training areas for use as the basis for classification. Various comparison methods are then used to determine if a specific pixel qualifies as a class member. ENVI provides a broad range of different classification methods.

2 In this tutorial, you will experiment with selecting training areas, also known as regions of interest (ROIs) using a DigitalGlobe WorldView-2 8 band multispectral image. Opening the WorldView-2 image 1. Go to File > Open External File>WorldView>GeoTiff. Note: If you have image files with the.rpb file in the metadata, particulary Level 1B image and OR2A, you can load the image using the RPC file. Open with RPC positioning. You can also open a Mosaic Tiled WorldView Product as well as GeoTiff and NITF using the Rigorous Sensor Model. For this exercise we ll load the GeoTiff directly. Fig.2. Opening WorldView Imagery 2

3 Fig.3. Select Image 2. Select the image file you would like to classify. In this case we ll load 10SEP M2AS _01_P001.TIF and click Open. Note: DigitalGlobe multispectral products will have M in contained within the file name. The file name 10SEP M2AS _01_P001.TIF contains M2AS. M meaning multispectral and 2AS describes the product level. In this case we are using an Ortho Ready Standard product or Level 2A. 3

4 The Available Bands List window will appear. Notice all 8 multispectral bands are present. In this case we ll load Bands 8, 3 and 2 from our WV-2 image. Fig.4. Available Bands List 3. Select RGB color and click on Band 8 (it will load into the Red Gun), click on Band 3 (it will load into the Green Gun) and click on Band 2 (it will load into the Blue Gun). Then click on Load RGB. This will load a false color combination using WorldView-2 s NIR-2 Band in combination with the Green and Blue band. Note: The Band numbers in the Available Bands List correlate with the bands of WorldView-2 as follows: Band 1 = Coastal Blue; Band 2 = Blue; Band 3 = Green; Band 4 = Yellow; Band 5 = Red; Band 6 = Red Edge; Band 7= Near Infrared 1; Band 8 = Near Infrared 2. You can load any type of band combination here. This is where you can begin to explore the different band combinations of WorldView-2. 4

5 Once loaded, the image will open in three views; a main window, a scroll window and a zoom window. Fig.5. View Window, Scroll Window and Zoom Window You can pan around the image using the scroll window and the main windows by clicking with the left mouse. You can also view the spectral signatures of pixels within the image by using the Z profile tool. To view the spectral signatures complete the following: 5

6 4. From the Display group menu bar, select Tools > Profiles > Z Profile (Spectrum) to begin extracting spectral profiles. 5. Examine the spectra for areas that you previewed above using color images and the Cursor/Location Value dialog by clicking the left mouse button in any of the display group Fig.6. Spectral Plot Note the relations between image color and spectral shape. Pay attention to the location of the image bands in the spectral profile, marked by the red, green, and blue bars in the plot. 6. From the Spectral Profile dialog menu bar, select File > Cancel. 6

7 Region of Interest Tool The next step in supervised classification is capturing your regions of interest. These will be the training samples. The classifier will use the spectral signature of the pixels within your region of interest to perform classification. Fig.7. Open ROI tool 7. In the Main View window select Tools > Region of Interest >ROI Tool 7

8 Fig.8. ROI Tool Begin to select regions of interest either in the Image, Scroll or Zoom windows. Note: Use the zoom window for better detail when collecting ROIs. 8. At the top of the ROI Tool select the Zoom button. You can begin collecting classes from your image. Capture at least 3 ROIs within a certain class for the best representation of the spectral signature within that class. 8

9 Fig.9. Collecting Regions of Interest 9. Left click within the zoom window to begin drawing your polygon. Two right clicks of the mouse will close the polygon. Scroll throughout the image and collect the different areas of the same class. In this example we start collecting vegetation. For this exercise we will clump healthy vegetation into one class as we are trying to pull out the healthy areas from the burn area in the image. 9

10 Fig.10. Collecting Multiple ROI and classes 10. Once you have collected at least 3 ROIs of the first class click on New Region in the ROI Tool and start collecting another class. In this case we ll collect samples of the burned area in the image. We will collect at least 3 areas. Note: Because we used a False Color band combination we can see the burn areas really stand out as grey/black in the image. 10

11 We repeat the steps for collection of additional classes in the image. In this case we ve collect 6 classes in the image; Healthy Vegetation, Burn, Roads, Water, Man Made, and Soil. Change the color of your ROI by right clicking on the color in the color column in the ROI tool and selecting an appropriate color. Fig.11. Example ROI classes Once you are satisfied with the classes you ve collected you will need to save this ROI file to perform your classification. 11. To save click on File > Save ROIs to File. Select all the classes you want used in the Supervised Classification and then Choose where you want to put the.roi file. 11

12 Fig.12. Save ROIs to File 12. In the Enter Ouput Filename [.roi] window navigate to where you want the file saved and give it a name. 12

13 Fig.13. Save ROI to folder 13. In this example we ve called the.roi file Fourmile Classes.roi. Click Open Fig.14. Save ROIs to File 13

14 14. Then click Ok Supervised Classification We ll now apply the ROI file that we created to the Supervised Classification. 15. To open Supervised Classification Go to Main ENVI tool bar > select Classification > Supervised > Maximum Likelihood. In this case we ll use the Maximum Likelihood method Maximum likelihood classification assumes that the statistics for each class in each band are normally distributed and calculates the probability that a given pixel belongs to a specific class. Unless a probability threshold is selected, all pixels are classified. Each pixel is assigned to the class that has the highest probability (i.e., the maximum likelihood). Fig.15. Classification 14

15 16. The Classification Input File menu will appear. Select the input file. We ll be using the WV-2 image we collected our ROIs in. Select that image. We ll keep all the defaults and not select Mask Band. You can use this function to leave out certain bands when performing classification. Fig.16. Classification Input File We ll now open our ROI file that we created to run our Maximum Likelihood Classification. 17. Click on Open at the bottom. 15

16 Fig.17. Select ROI file for Classification 18. Scroll down to ROI File and left click with your mouse. 16

17 Fig.18. Select ROI file 19. Navigate to your ROI file and select it and click Open A message will appear which states that your regions are restored (Fig.19). Fig.19. Classes Restored 17

18 Fig.20. Classification Input File 20. Click OK to accept 18

19 You ll now set up your Parameters for Maximum Likelihood (See Fig. 21). 21. Select the classes you want to use in the classification in the select classes from Regions. We ll Set Probability Threshold to none. We ll output to a file the classification image. Click on Choose and navigate to the folder you want to store the file in. Give it a name. Here we call it Fourmile_Classification. We will also output a rule image and call it Fourmile_rule. Click on OK to run. The status window will appear (See Fig.22) Fig.21. Maximum Likelihood Parameters 19

20 Fig.22. Classifier status window Once the classification is complete a new classification image will appear in the Available bands list. 22. Click on the Classification image. In this case, Fourmile_Classification (Max Like file) and click Load Band at the bottom. Fig.23. Available Bands List 20

21 Your Classification image will then load into the viewer. Fig.24. Example of Classification Image 21

22 Post Classification Processing Classified images require post-processing to evaluate classification accuracy and to generalize classes for export to image-maps and vector GIS. Post Classification can be used to classify rule images; to calculate class statistics and confusion matrices; to apply majority or minority analysis to classification images; to clump, sieve, and combine classes; to overlay classes on an image; to calculate buffer zone images; to calculate segmentation images; and to output classes to vector layers. ENVI provides a series of tools to satisfy these requirements. We ll take a look at clumping and sieving which will help clean up the classification file. Clump and Sieve are used to generalize classification images. Sieve is usually run first to remove the isolated pixels based on a size (number of pixels) threshold, then clump is run to add spatial coherency to existing classes by combining adjacent similar classified areas. 1. From the ENVI main menu bar, select Classification > Post Classification > Sieve Classes. The Classification Input File dialog appears. 2. Select the Classification.img file within the Select Input File section of this dialog and click OK. In our case we ll select the Fourmile_Classification file. The Sieve Parameters dialog appears. 3. Click the Output Result to Memory radio button, then click OK. The image is loaded into the Available Bands List. 4. You will now use the output of the sieve operation as the input for clumping. From the ENVI main menu bar, select Classification > Post Classification > Clump Classes. The Classification Input File dialog appears. 5. Select the previously created image file from memory, and click OK. The Sieve Parameters dialog appears. 6. Click the Output Result to Memory radio button, then click OK. The image is loaded into the Available Bands List. 7. Compare the three images (Fourmile_Classification.img, Clump, and Sieve) and reiterate if necessary to produce a generalized classification image. For more information on ExelisVis ENVI 4.8 product please visit For more technical information on DigitalGlobe Products and Services please visit the Resources tab at 22

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